expat: integer overflow in the doProlog function

A flaw was found in expat. The vulnerability occurs due to large content in element type declarations when there is an element declaration handler present which leads to an integer overflow. This flaw allows an attacker to inject an unsigned integer, leading to a crash or a denial of service...

expat: internal entity expansion

expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XMLSetEntityDeclHandler function, which allows remote attackers to cause a denial of service resource consumption, send HTTP requests to intranet servers, or read arbitrary files via a...

firefox: thunderbird: expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing

A memory amplification vulnerability in libexpat allows attackers to trigger excessive dynamic memory allocations by submitting specially crafted XML input. A small input 250 KiB can cause the parser to allocate hundreds of megabytes, leading to denial-of-service DoS through memory exhaustion...

Important: Red Hat Security Advisory: expat security update

An update for expat is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for...

SUSE-SU-2025:21028-1 Security update for expat

This update for expat fixes the following issues: - CVE-2025-59375: Fixed large dynamic memory allocations via a small document submitted for parsing bsc1249584...

SUSE-SU-2025:21006-1 Security update for expat

This update for expat fixes the following issues: - CVE-2025-59375: Fixed large dynamic memory allocations via a small document submitted for parsing bsc1249584...

OPENSUSE-SU-2025:20055-1 Security update for expat

This update for expat fixes the following issues: - CVE-2025-59375: Fixed large dynamic memory allocations via a small document submitted for parsing bsc1249584...

ALSA-2025:21776 Important: expat security update

Expat is a C library for parsing XML documents. Security Fixes: expat: libexpat in Expat allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing CVE-2025-59375 For more details about the security issues, including the impact, a CVSS score,...

RHEL 8 : expat (RHSA-2025:21776)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:21776 advisory. Expat is a C library for parsing XML documents. Security Fixes: expat: libexpat in Expat allows attackers to trigger large dynamic memory allocation...

RHEL 9 : expat (RHSA-2025:21773)

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2025:21773 advisory. Expat is a C library for parsing XML documents. Security Fixes: expat: libexpat in Expat allows attackers to trigger large dynamic memory allocation...

OESA-2025-2672 expat security update

expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial. Security Fixes: A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML...

OESA-2025-2674 expat security update

expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial. Security Fixes: A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML...

OESA-2025-2673 expat security update

expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial. Security Fixes: A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML...

Siemens SIMATIC S7-1500 Improper Restriction of XML External Entity Reference (CVE-2018-20843)

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing enough to be usable for denial-of-service attacks. This plugin only works with Tenable.ot. Please visit...

Siemens SIMATIC S7-1500 Integer Overflow or Wraparound (CVE-2022-22822)

addBinding in xmlparse.c in Expat aka libexpat before 2.4.3 has an integer overflow. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C Tenable, Inc. include'compat.inc'; if description scriptid504286;...

Siemens SIMATIC S7-1500 Exposure of Resource to Wrong Sphere (CVE-2022-25236)

xmlparse.c in Expat aka libexpat before 2.4.5 allows attackers to insert namespace-separator characters into namespace URIs. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C Tenable, Inc...

Siemens SIMATIC S7-1500 Uncontrolled Resource Consumption (CVE-2021-45960)

In Expat aka libexpat before 2.4.3, a left shift by 29 or more places in the storeAtts function in xmlparse.c can lead to realloc misbehavior e.g., allocating too few bytes, or only freeing memory. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot fo...

Siemens SIMATIC S7-1500 Integer Overflow or Wraparound (CVE-2022-23852)

Expat aka libexpat before 2.4.4 has a signed integer overflow in XMLGetBuffer, for configurations with a nonzero XMLCONTEXTBYTES. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C Tenable, Inc...

Siemens SIMATIC S7-1500 Integer Overflow or Wraparound (CVE-2022-22826)

nextScaffoldPart in xmlparse.c in Expat aka libexpat before 2.4.3 has an integer overflow. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C Tenable, Inc. include'compat.inc'; if description scriptid504222;...

Siemens SIMATIC S7-1500 Integer Overflow or Wraparound (CVE-2022-23990)

Expat aka libexpat before 2.4.4 has an integer overflow in the doProlog function. This plugin only works with Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information. %NASLMINLEVEL 80900 C Tenable, Inc. include'compat.inc'; if description scriptid504304;...